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Is there any issue to run a g2pro and a g3pro side by side on in the same tank? I will be putting the xr30s on a red sea reefer 250. Anything I need to do to ensure the lights are similar?

thanks

You would have no issues with running a gen 2 and a gen 3 side by side, but since they are different gens, the colors will probably be a little different.
To get them to look the same you would probably have to upgrade the gen 2.